US7255297B2 - Adaptive tape drive roller guide - Google Patents
Adaptive tape drive roller guide Download PDFInfo
- Publication number
- US7255297B2 US7255297B2 US10/861,750 US86175004A US7255297B2 US 7255297 B2 US7255297 B2 US 7255297B2 US 86175004 A US86175004 A US 86175004A US 7255297 B2 US7255297 B2 US 7255297B2
- Authority
- US
- United States
- Prior art keywords
- reel
- tape
- roller
- linear velocity
- tape medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/60—Guiding record carrier
- G11B15/66—Threading; Loading; Automatic self-loading
- G11B15/67—Threading; Loading; Automatic self-loading by extracting end of record carrier from container or spool
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/26—Driving record carriers by members acting directly or indirectly thereon
- G11B15/32—Driving record carriers by members acting directly or indirectly thereon through the reels or cores on to which the record carrier is wound
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/60—Guiding record carrier
Definitions
- Storage subsystems such as magnetic tape libraries, are widely used for storing information in digital form. These tape subsystems may include a storage subsystem controller for controlling one or more tape drive systems contained within the storage subsystem and for controlling other components of the storage subsystem, such as the tape picker, which is used to select and load tape cartridges into the tape drives.
- the storage subsystem may be coupled to a host system which transmits I/O requests to the storage subsystem via a host/storage connection.
- Each tape drive reads and writes data to the primary storage medium, which can be, for example, a magnetic tape medium contained within a removable magnetic tape cartridge.
- the magnetic tape medium typically comprises a thin film of magnetic material which stores the data.
- the tape medium may be moved by the tape drive between a pair of spaced apart reels and past a data transducer to record or read back information.
- one of the reels is part of the tape drive while the other reel is part of the removable tape cartridge.
- the reel which is a part of the tape drive is commonly referred to as a take-up reel
- the reel which is a part of the tape cartridge is commonly referred to as a cartridge reel.
- FIG. 1 An exemplary tape drive system 100 is shown in FIG. 1 .
- This tape drive system 100 uses a removable tape cartridge 106 containing a cartridge reel 108 .
- a storage tape 110 having a thin film of magnetic material which stores data is wound about the cartridge reel 108 .
- the storage tape 110 is moved between a take-up reel 120 and a cartridge reel 108 , past one or more head assemblies 104 to record and/or read back information from the storage tape 110 .
- the storage tape 110 on the cartridge reel 106 is coupled to the take-up reel 120 of the tape drive 100 .
- the storage tape 110 is rewound onto the cartridge reel 106 and is then uncoupled from the take-up reel 120 .
- One or more guides may be provided along the tape path to guide the storage tape 110 as it passes between the cartridge reel 108 and the take-up reel 120 .
- the guides may comprise stationary guides, which remain stationary as the storage tape 110 passes back and forth.
- a static frictional force exists between the storage tape 110 and the stationary guide. This static frictional force is overcome by a shear force generated when one of the reel drivers rotates one of the reels 108 , 120 to pull the tape 110 across the stationary guide.
- a cushion of air may be formed between the tape 110 and the stationary guide, thereby reducing the frictional force between the tape 110 and the guide.
- the shear force applied to overcome the static frictional force can cause damage to the tape 110 . Over time, this may result in tape failures or data loss.
- the guides comprise rotating rollers 102 .
- the rollers 102 roll with the tape to thereby reduce stress on the storage tape 110 .
- a static frictional force again exists between the roller 102 and the tape 110 .
- the roller 102 rotates with the tape, thereby reducing the shear stress on the tape media.
- rollers 102 may introduce noise in the tape drive system 100 , which may result in unpredictable positioning errors of the tape 110 . Irregularities in the bearings, machining, and assembly can cause axial and radial runout of the roller 102 . As the speed of the tape 110 increases, the amount of noise generated by the rollers 102 may increase as well, thus placing more demand on the head assembly positioning servo control system to accurately follow the data tracks on the tape 110 .
- LTM lateral tape motion
- Lateral motion is movement of the tape in a direction orthogonal to primary direction of the tape path.
- One approach to minimizing LTM tracking errors is to provide a multi-roller tape guide structure, such as the type described in commonly assigned U.S. Pat. No. 5,414,585, to Saliba, entitled, “Rotating Tape Edge Guide”, the disclosure of which is incorporated herein by reference in its entirety.
- An optical servo mechanism can be employed to track and monitor lateral motion of a magnetic tape relative to a head assembly 104 .
- the head assembly 104 can be actively positioned so as to maintain proper tracking.
- the magnetic tape 110 can be provided with an optically detectable servo track that can be detected by an optical pick up head that projects a beam of light onto the servo track and detects light reflected back from the servo track.
- the track position information from the servo track may be fed into a servo control loop that keeps the head assembly properly positioned.
- the tape in order to increase the transfer of data, the tape must be moved faster and a problem arises when the frequency of the lateral tape movement approaches or exceeds the frequency of the servo control loop, thereby limiting the total capacity of the cartridge. At this point, the servo mechanism may not be capable of maintaining proper positioning of the head assembly 104 , resulting in tracking errors.
- a tape drive comprising: a first reel motor for rotating a first reel having a data storage tape medium wound about the first reel; a data transfer head; a second reel motor for rotating a second reel to draw the tape medium from the first reel, across the data transfer head, and onto the second reel; and at least one adaptive bearing for guiding the tape medium between the first reel and the second reel, the adaptive bearing comprising a roller having a first rotational resistance as the tape medium travels past the adaptive bearing at a first linear velocity and having a second rotational resistance greater than the first rotational resistance when the tape medium travels past the adaptive bearing at a second linear velocity greater than the first linear velocity.
- a method of operating a tape drive comprising: drawing a data storage tape medium across a data transfer head between a first reel and a second reel using a first reel motor and a second reel motor; guiding the tape medium between the first reel and the second reel using at least one roller; adjusting a rotational resistance of the at least one roller to apply a first rotational resistance as the tape medium travels past the roller at a first linear velocity and to apply a second rotational resistance greater than the first rotational resistance when the tape medium travels past the roller at a second linear velocity greater than the first linear velocity.
- a tape drive comprising: a first reel motor for rotating a first reel having a data storage tape medium wound about the first reel; a data transfer head; a second reel motor for rotating a second reel to draw the tape medium from the first reel, across the data transfer head, and onto the second reel; at least one roller for guiding the tape medium between the first reel and the second reel; and a means for adjusting a rotational resistance of the roller such that the roller has a first rotational resistance as the tape medium travels past the roller at a first linear velocity and a second rotational resistance greater than the first rotational resistance when the tape medium travels past the roller at a second linear velocity greater than the first linear velocity.
- a tape drive comprising: a first reel motor for rotating a first reel having a data storage tape medium wound about the first reel; a data transfer head; a second reel motor for rotating a second reel to draw the tape medium from the first reel, across the data transfer head, and onto the second reel; and at least one adaptive bearing for guiding the tape medium between the first reel and the second reel, wherein during operation while the tape medium is being drawn across the data transfer head at a first linear velocity and the data transfer head is reading data from or writing data to the tape medium, the adaptive bearing rotates at a rotational velocity corresponding to a non-zero linear velocity that is less than the first linear velocity.
- FIG. 1 shows a simplified block diagram of a tape drive system.
- FIG. 2 shows a perspective view of a tape drive system in accordance with embodiments of the present invention.
- FIG. 3 shows a perspective view of an adaptive bearing in accordance with embodiments of the present invention.
- FIG. 4 is a chart illustrating the rotational speeds of a conventional roller and a roller having an eddy current brake, in accordance with embodiments of the present invention.
- FIG. 5 is a chart illustrating the high amplitude peaks at harmonics of the roller rotation frequency.
- FIG. 2 shows a perspective view of a portion of a tape drive system 200 , in accordance with embodiments of the present invention.
- a take-up reel 220 having a storage tape 210 partially wound about the take-up reel 220 is shown.
- the storage tape 210 travels along a tape path which takes the storage tape 210 past several rollers (rollers 202 a - 202 d are shown; other rollers not shown may also be used) and past the head assembly 204 .
- the head assembly 204 comprises a data transfer head 230 , which is positioned adjacent to a data storage side of the storage tape 210 , and a servo detector 240 , which is positioned adjacent a servo side of the storage tape 210 .
- the storage tape 210 comprises a data storage side and an opposing servo side.
- the servo side of the tape comprises an indicator which is detected by the servo detector 240 .
- This information is used to adjust the positioning of the data transfer head 230 in response to lateral tape motion.
- this servo detector 240 may comprise an optical servo detector which optically detects a marking (such as, e.g., a line, dot, or pattern of dots) having a known position relative to the tracks of data on the data storage side.
- a marking such as, e.g., a line, dot, or pattern of dots
- one or more rollers 202 may be configured to have a first rotational resistance at low rotational velocities and a higher rotational resistance at higher speeds. Therefore, at start-up and at low linear tape speeds, very little rotational resistance is applied, thereby allowing the rollers 202 to rotate freely. This can help to reduce the stress on the tape 210 at start-up. At high tape speeds, the static forces between the tape and the rollers are negligible, while the noise introduced by rollers rotating at high speed becomes more significant. Therefore, at high tape speeds, an increased rotational resistance is applied to the rollers 202 , thereby reducing the rotational velocity of the rollers 202 and, in turn, reducing the noise associated with increased roller speed.
- This variable resistance can be accomplished, for example, by positioning one or more magnetic members 250 adjacent to each roller 202 .
- two magnetic members 250 a - 250 b are shown. These magnetic members 250 may establish an eddy current brake on the roller 202 , which would provide a variable rotational resistance depending on the rotational velocity of the roller 202 . This variable rotational resistance would increase as the rotational velocity of the roller 202 increases.
- the magnetic members 250 may comprise, for example, a block of magnetic material or an electromagnet.
- the rollers 202 may be, for example, coated with any conductive, non-magnetic material, such as aluminum, an aluminum alloy, or nickel.
- An eddy current is a swirling current produced in a conductive material in response to a changing magnetic field.
- rotation of the roller produces eddy currents in the roller.
- These eddy currents oppose the rotation of the roller, thereby creating a non-contact braking force on the roller.
- the braking force generated by the eddy current increases as well.
- the strength of the eddy current field may be adjusted by varying the gap between the roller 202 and the magnetic member 250 , and may also be adjusted by varying the magnetic strength of the magnetic member 250 or the composition of the roller 202 .
- the strength of the eddy current can be tuned to control the roller speed profile as desired.
- the roller speed profile may be tuned such that at low linear tape speeds (which result in low roller rotational velocities), the magnetic members 250 produce very little rotational resistance, while at high tape speeds (such as, e.g., the full tape speed during recording), the magnetic members 250 produce high rotational resistance.
- FIG. 3 is a perspective view of a roller 202 , rotatably mounted onto a support bracket 252 , in accordance with embodiments of the present invention.
- the magnetic member 250 is mounted onto an interior surface of the support bracket 252 closely adjacent to but not in contact with the outer surface of the roller 202 .
- the magnetic member 250 does not induce a changing magnetic field in the roller 202 .
- Other forces, such as inertia and friction between the roller 202 and the support bracket 252 may cause some rotational resistance, but when the roller 202 is not moving, the magnetic member 250 does not contribute to the overall rotational resistance.
- the illustrated arrangement may be particularly desirable in some embodiments because of the ease with which existing roller assembly designs can be modified to incorporate the eddy current brake. In some cases, the only significant modifications are the mounting of the magnetic member 250 onto the existing support bracket 252 and the tuning of the magnetic force provided by the magnetic member 250 to provide the desired braking force.
- the friction between the tape 210 and the roller 202 causes the roller to begin rotating with the moving tape 210 .
- the rotational velocity of the roller 202 increases, the strength of the eddy current induced by the magnetic member 250 increases as a result of the increasing rotational speed of the roller 202 , thereby increasing the rotational resistance of the roller 202 .
- This increased rotational resistance operates to restrain the velocity of the roller 202 .
- a cushion of air begins to form between the tape 210 and the roller 202 . This cushion of air reduces the force applied by the tape 210 onto the roller 202 , which also serves to reduce the rotational velocity of the roller 202 .
- FIG. 4 is a chart illustrating the rotational speeds of a conventional roller and a roller having an eddy current brake, in accordance with embodiments of the present invention.
- the x-axis corresponds to the elapsed time from when the tape begins moving
- the y-axis corresponds to the rotational velocity of the roller in hertz.
- Line 401 corresponds to the conventional roller
- line 402 corresponds to a roller having an eddy current brake. It can be seen that as time passes and the linear tape velocity gradually increases, the rotational velocity of the conventional roller increases with the linear tape velocity.
- the rotational velocity of the roller remains constant (as indicated by the plateau of line 401 ).
- the rotational velocity of the roller having an eddy current brake increases at nearly the same rate as the conventional roller at the beginning of tape movement, but as the linear tape velocity continues to increase, the rotational velocity increases until the two forces balance.
- the rotational velocity reaches an approximately steady rotational velocity much lower than the rotational velocity of the conventional roller.
- FIG. 5 is a chart illustrating the high amplitude peaks at harmonics of the roller rotation frequency up to several hundred hertz.
- Line 501 corresponds to a conventional roller and line 502 corresponds to a roller having an eddy current brake.
- the high amplitude peaks of line 501 place a large demand on the servo system to effectively track the moving tape as it passes by the head assembly 204 .
- line 502 is achieved having much lower peaks.
- the cumulative effect of the reduced peaks is seen in the superimposed chart, where line 511 corresponds to the conventional roller and line 512 corresponds to the roller having an eddy current brake. As shown by FIG.
- the use of the eddy current brake may result in a tracking error improvement of 37%.
- the eddy current brake in order to ensure that the servo system is capable of compensating for LTM during operation, is configured to maintain the rotational frequency governed and selected by the designer where the rollers' contributions to the lateral motion are at a level that could be sufficiently corrected by the operational frequency of the servo system.
- the eddy current brake is configured to maintain the rotational frequency of the rollers at a level less than one third the maximum operational frequency of the servo system.
- the tape drive system 200 includes a take-up reel 220 that is driven by a take-up reel motor.
- a removable cartridge containing a cartridge reel is inserted into the tape drive system 200 and the cartridge reel is rotated by a supply motor.
- the take-up reel motor and the supply motor alternate in driving the movement of the tape.
- the take-up reel motor is powering the rotation of the take-up reel 220 to draw the tape 210 from the tape cartridge, the tape 210 travels in a first direction across the head assembly 204 .
- the supply motor can provide a drag on the cartridge reel.
- the take-up reel motor can provide a drag on the take-up reel 220 to create the desired tape tension.
- the rollers 202 serve to guide the tape 210 as it travels along the tape path, and it is desirable to minimize the amount of drag caused by the rollers 202 .
- the motors are not configured to supply the desired drag.
- the rollers in these prior art systems are configured to supply a drag on the tape so as to create tension across the data transfer head.
- the rollers having a variable rotational resistance are configured so as to continue rotating, even after the eddy current brake balances the rotational forces with the increasing the rotational resistance. Therefore, during operation, a viscous contact between the tape and the roller is maintained.
- the only time that the roller stops rotating is when the tape 210 stops moving or changes direction, which would result in the roller changing its direction of rotation as well.
- An advantage that may be achieved by maintaining some rotation of the roller at all times while the tape is streaming past the roller is that tape and roller guide damage may be reduced. This is because when the tape slows down, the air layer formed between the tape and the roller begins to reduce.
- the roller If the roller is stationary, then at a certain point in the reduction of the air layer, the moving tape will come in contact with a static roller, causing a dramatic increase in shear stress in the tape and roller. In contrast, if the roller maintains some rotation as the tape slows down, the shear stress caused by the contact between the slowing tape and the roller will be reduced because both the tape and the roller will be moving in the same direction, thereby reducing the velocity differential between the tape and the roller at the time of contact. Maintaining this rotation of the rollers during operation may be particularly important when the tape surface and roller surface have a high roughness, which would exacerbate the shear stresses caused when a moving tape lands on a static roller.
- a tape drive system having guides that provide the advantages of rotating roller guides at low tape speeds and some of the important benefits of stationary guides at high tape speeds, such as lower lateral motion at high frequencies is provided.
- the eddy current brake is created by mounting a magnetic material adjacent to the roller surface.
- the variable rotational resistance can be provided using other methods.
- an electromagnet could be provided adjacent the rotating roller.
- the magnetic field can be adjusted electronically, as desired.
- the roller could be made of a magnetic material, and the magnetic field created by the electromagnet could be actively adjusted during operation to provide the desired level of rotational resistance.
- use of a conventional magnetic material may be desirable because of reduced cost and complexity.
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
Abstract
Description
Claims (22)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/861,750 US7255297B2 (en) | 2004-06-04 | 2004-06-04 | Adaptive tape drive roller guide |
JP2005162630A JP2005346905A (en) | 2004-06-04 | 2005-06-02 | Tape drive and method for operating tape drive |
EP05253380A EP1605452A3 (en) | 2004-06-04 | 2005-06-02 | Adaptive tape drive roller guide |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/861,750 US7255297B2 (en) | 2004-06-04 | 2004-06-04 | Adaptive tape drive roller guide |
Publications (2)
Publication Number | Publication Date |
---|---|
US20060007593A1 US20060007593A1 (en) | 2006-01-12 |
US7255297B2 true US7255297B2 (en) | 2007-08-14 |
Family
ID=34941542
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/861,750 Expired - Fee Related US7255297B2 (en) | 2004-06-04 | 2004-06-04 | Adaptive tape drive roller guide |
Country Status (3)
Country | Link |
---|---|
US (1) | US7255297B2 (en) |
EP (1) | EP1605452A3 (en) |
JP (1) | JP2005346905A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080278846A1 (en) * | 2007-05-10 | 2008-11-13 | Imation Corp. | High friction rotating guide and magnetic tape system |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11994169B2 (en) * | 2022-08-22 | 2024-05-28 | International Business Machines Corporation | Guide roller having magnets and bushings to stabilize a roller barrel for a tape medium |
Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3636277A (en) * | 1969-11-12 | 1972-01-18 | Herbert Pohler | Video tape recorder with single motor-driving head wheel and capstan through respective magnetic clutches |
US4162051A (en) * | 1978-08-02 | 1979-07-24 | Westinghouse Electric Corp. | Tape recorder having magnetically controlled tape tensioning |
US4162774A (en) | 1977-10-17 | 1979-07-31 | Verbatim Corporation | Belt drive cartridge |
US4455001A (en) | 1977-11-11 | 1984-06-19 | Raymond Engineering Inc. | Tape transport cartridge |
US4456160A (en) | 1980-10-27 | 1984-06-26 | Basf Aktiengesellschaft | Guide device for a recording medium in tape form, especially a magnetic tape |
US5323279A (en) | 1989-09-28 | 1994-06-21 | Sharp Kabushiki Kaisha | Magnetic tape driving apparatus with capstan rotating at different speeds |
US5346155A (en) | 1992-04-30 | 1994-09-13 | Minnesota Mining And Manufacturing Company | Belt driven cartridge with magnetic brake assembly |
US5363256A (en) | 1990-12-06 | 1994-11-08 | Canon Kabushiki Kaisha | Tape tension adjusting device |
US5414585A (en) | 1993-07-19 | 1995-05-09 | Quantum Corp. | Rotating tape edge guide |
US5823455A (en) | 1996-12-20 | 1998-10-20 | Imation Corp. | Belt-driven data storage device with corner roller assemblies preselected to have different drag force profiles |
US6018434A (en) | 1997-01-14 | 2000-01-25 | Quantum Corporation | Tape cartridge having written-in-defect servo patterns for rapid head position calibration |
US6125096A (en) | 1998-04-08 | 2000-09-26 | Stomage Technology Comporation | Dynamic/stationary tape guide |
US6246535B1 (en) | 1998-11-13 | 2001-06-12 | Quantum Corporation | Optical apparatus for tracking a magnetic tape |
US20010023885A1 (en) * | 2000-02-18 | 2001-09-27 | Ewald Fraberger | Recording and/or reproducing apparatus including at least one guide arrangement having at least one damping projection |
US6600624B2 (en) | 1999-08-10 | 2003-07-29 | Quantum Corporation | Guiding method utilizing roller surface features |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57195359A (en) * | 1981-05-25 | 1982-12-01 | Hitachi Denshi Ltd | Tape guide device |
JPH0668557A (en) * | 1992-08-21 | 1994-03-11 | Matsushita Electric Ind Co Ltd | Tape carrying device |
JPH0721635A (en) * | 1993-07-05 | 1995-01-24 | Hitachi Ltd | Rotary tape guide of magnetic recording and reproducing device |
DE19913382C2 (en) * | 1998-03-24 | 2002-08-14 | Quantum Corp | Multi-channel magnetic tape system with an optical track servo |
JP2003151189A (en) * | 2001-11-15 | 2003-05-23 | Fuji Photo Film Co Ltd | Guide roller for guiding tape |
-
2004
- 2004-06-04 US US10/861,750 patent/US7255297B2/en not_active Expired - Fee Related
-
2005
- 2005-06-02 JP JP2005162630A patent/JP2005346905A/en active Pending
- 2005-06-02 EP EP05253380A patent/EP1605452A3/en not_active Withdrawn
Patent Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3636277A (en) * | 1969-11-12 | 1972-01-18 | Herbert Pohler | Video tape recorder with single motor-driving head wheel and capstan through respective magnetic clutches |
US4162774A (en) | 1977-10-17 | 1979-07-31 | Verbatim Corporation | Belt drive cartridge |
US4455001A (en) | 1977-11-11 | 1984-06-19 | Raymond Engineering Inc. | Tape transport cartridge |
US4162051A (en) * | 1978-08-02 | 1979-07-24 | Westinghouse Electric Corp. | Tape recorder having magnetically controlled tape tensioning |
US4456160A (en) | 1980-10-27 | 1984-06-26 | Basf Aktiengesellschaft | Guide device for a recording medium in tape form, especially a magnetic tape |
US5323279A (en) | 1989-09-28 | 1994-06-21 | Sharp Kabushiki Kaisha | Magnetic tape driving apparatus with capstan rotating at different speeds |
US5363256A (en) | 1990-12-06 | 1994-11-08 | Canon Kabushiki Kaisha | Tape tension adjusting device |
US5346155A (en) | 1992-04-30 | 1994-09-13 | Minnesota Mining And Manufacturing Company | Belt driven cartridge with magnetic brake assembly |
US5414585A (en) | 1993-07-19 | 1995-05-09 | Quantum Corp. | Rotating tape edge guide |
US5823455A (en) | 1996-12-20 | 1998-10-20 | Imation Corp. | Belt-driven data storage device with corner roller assemblies preselected to have different drag force profiles |
US6018434A (en) | 1997-01-14 | 2000-01-25 | Quantum Corporation | Tape cartridge having written-in-defect servo patterns for rapid head position calibration |
US6125096A (en) | 1998-04-08 | 2000-09-26 | Stomage Technology Comporation | Dynamic/stationary tape guide |
US6246535B1 (en) | 1998-11-13 | 2001-06-12 | Quantum Corporation | Optical apparatus for tracking a magnetic tape |
US6600624B2 (en) | 1999-08-10 | 2003-07-29 | Quantum Corporation | Guiding method utilizing roller surface features |
US20010023885A1 (en) * | 2000-02-18 | 2001-09-27 | Ewald Fraberger | Recording and/or reproducing apparatus including at least one guide arrangement having at least one damping projection |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080278846A1 (en) * | 2007-05-10 | 2008-11-13 | Imation Corp. | High friction rotating guide and magnetic tape system |
Also Published As
Publication number | Publication date |
---|---|
EP1605452A2 (en) | 2005-12-14 |
US20060007593A1 (en) | 2006-01-12 |
JP2005346905A (en) | 2005-12-15 |
EP1605452A3 (en) | 2008-03-05 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: QUANTUM CORPORATION, CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SALIBA, GEORGE A.;REEL/FRAME:015346/0379 Effective date: 20041019 |
|
AS | Assignment |
Owner name: KEYBANK NATIONAL ASSOCIATION, AS ADMINISTRATIVE AG Free format text: INTELLECTUAL PROPERTY SECURITY AGREEMENT (SECOND LIEN);ASSIGNOR:QUANTUM CORPORATION;REEL/FRAME:018269/0005 Effective date: 20060822 |
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AS | Assignment |
Owner name: KEYBANK NATIONAL ASSOCIATION, AS ADMINISTRATIVE AG Free format text: INTELLECTUAL PROPERTY SECURITY AGREEMENT (FIRST LIEN);ASSIGNOR:QUANTUM CORPORATION;REEL/FRAME:018307/0001 Effective date: 20060822 |
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